Secondary Cell Group Activation Upon Master Node Failure
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Solution Overview
Problem
In 5G wireless communication systems, upon failure of the master node link, existing methods struggle to efficiently manage the activation of secondary cell groups for fast recovery, particularly when user equipment does not require SCG resources or lacks full dual connectivity capability.
Innovation Solution
A method is introduced where the activation of a secondary cell group (SCG) is delayed upon detecting a failure in the master cell group (MCG), involving the performance of a random access procedure on an SCG cell, allowing for suspended SCG link usage and enabling fast recovery from RRC connection failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary cell group (SCG) is activated immediately upon master cell group (MCG) failure detection, then fast recovery from RRC connection failure is achieved, but unnecessary resource usage and complexity increase for user equipments that do not require SCG resources or lack full dual connectivity capability
Solution Approach 1:
The system performs preliminary configuration of the SCG before MCG failure occurs, maintaining it in a suspended state with pre-established link parameters. Upon MCG failure detection, the UE can immediately activate the pre-configured SCG without performing full setup procedures, achieving fast recovery while avoiding unnecessary activation for UEs that don't need it.
Solution Approach 2:
The SCG link is maintained in a dynamic suspended state rather than being permanently activated or discarded. This dynamic state allows the UE to quickly transition to SCG operation when MCG failure occurs, while avoiding continuous resource consumption when SCG is not needed, thus balancing reliability improvement with complexity reduction.
2Reliability
If the secondary cell group (SCG) is activated for all user equipments upon master cell group (MCG) failure, then network resilience is improved, but resource consumption and system complexity increase for UEs that do not require SCG resources
Solution Approach 1:
The solution applies different quality states to different UEs based on their specific needs and capabilities. UEs that require SCG resources maintain the suspended SCG configuration for fast recovery, while UEs that don't need SCG resources can discard the configuration, avoiding unnecessary power consumption. This local differentiation achieves network resilience improvement only where needed.
Solution Approach 2:
The system changes the operational parameter of the SCG from fully activated to suspended state. In this suspended state, essential configuration parameters are maintained while non-essential parameters are released, reducing power consumption for UEs that don't need full SCG functionality while preserving the ability to quickly recover when needed.
3Productivity
If the secondary cell group (SCG) activation is delayed upon master cell group (MCG) failure detection, then resource efficiency is improved for UEs not requiring SCG resources, but recovery speed may be reduced
Solution Approach 1:
The SCG configuration is preliminarily established and maintained in a suspended state before MCG failure occurs. This preliminary action ensures that when failure happens, the UE can immediately activate the pre-configured SCG without delay for configuration setup, achieving both fast recovery and resource efficiency by avoiding continuous full activation.
Data Source
AI summary
A method and apparatus for activation of secondary cell group (SCG) configuration upon master cell group (MCG) failure detection in a wireless communication system is provided. A wireless device delays activation of a SCG. When the wireless device detects a failure on a master cell group (MCG) while delaying the activation of the SCG, the wireless device activates the SCG, and performs a random access procedure on a cell of the SCG.